The fact that you are calling common house appliances "modern tech" made me smile, but essentially you are right, anything that came about in the last 100 years can be called modern.

As for whether it caused more women to work, I can imagine that it really did facilitate the transition. It would take much longer if women had to negotiate housework with their husbands first. Instead, it happened the other way around, women came out to work first, while doing household chores at the same time, and in time men transitioned to helpful spouses later.